SELECT 
  cscart_pages.*, 
  cscart_page_descriptions.*, 
  cscart_seo_names.name as seo_name, 
  cscart_seo_names.path as seo_path 
FROM 
  cscart_pages 
  LEFT JOIN cscart_page_descriptions ON cscart_pages.page_id = cscart_page_descriptions.page_id 
  AND cscart_page_descriptions.lang_code = 'ru' 
  LEFT JOIN cscart_seo_names ON cscart_seo_names.object_id = cscart_pages.page_id 
  AND cscart_seo_names.type = 'a' 
  AND cscart_seo_names.dispatch = '' 
  AND cscart_seo_names.lang_code = 'ru' 
  INNER JOIN cscart_ult_objects_sharing ON (
    cscart_ult_objects_sharing.share_object_id = cscart_pages.page_id 
    AND cscart_ult_objects_sharing.share_company_id = 1 
    AND cscart_ult_objects_sharing.share_object_type = 'pages'
  ) 
WHERE 
  1 
  AND cscart_pages.parent_id IN (7) 
  AND cscart_pages.status IN ('A') 
  AND cscart_pages.page_type IN ('B') 
  AND (
    cscart_pages.usergroup_ids = '' 
    OR FIND_IN_SET(0, cscart_pages.usergroup_ids) 
    OR FIND_IN_SET(1, cscart_pages.usergroup_ids)
  ) 
  AND (
    cscart_pages.use_avail_period = 'N' 
    OR (
      cscart_pages.use_avail_period = 'Y' 
      AND cscart_pages.avail_from_timestamp <= 1764990319 
      AND (
        cscart_pages.avail_till_timestamp >= 1764990319 
        OR cscart_pages.avail_till_timestamp = 0
      )
    )
  ) 
ORDER BY 
  cscart_pages.timestamp desc 
LIMIT 
  0, 100

Query time 0.00066

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "1.67"
    },
    "ordering_operation": {
      "using_filesort": true,
      "nested_loop": [
        {
          "table": {
            "table_name": "cscart_pages",
            "access_type": "ref",
            "possible_keys": [
              "PRIMARY",
              "parent_id"
            ],
            "key": "parent_id",
            "used_key_parts": [
              "parent_id"
            ],
            "key_length": "3",
            "ref": [
              "const"
            ],
            "rows_examined_per_scan": 4,
            "rows_produced_per_join": 0,
            "filtered": "1.64",
            "cost_info": {
              "read_cost": "1.00",
              "eval_cost": "0.01",
              "prefix_cost": "1.40",
              "data_read_per_join": "166"
            },
            "used_columns": [
              "page_id",
              "company_id",
              "parent_id",
              "id_path",
              "status",
              "page_type",
              "position",
              "timestamp",
              "usergroup_ids",
              "localization",
              "new_window",
              "use_avail_period",
              "avail_from_timestamp",
              "avail_till_timestamp",
              "facebook_obj_type"
            ],
            "attached_condition": "((`primapearl_r_new`.`cscart_pages`.`status` = 'A') and (`primapearl_r_new`.`cscart_pages`.`page_type` = 'B') and ((`primapearl_r_new`.`cscart_pages`.`usergroup_ids` = '') or (0 <> find_in_set(0,`primapearl_r_new`.`cscart_pages`.`usergroup_ids`)) or (0 <> find_in_set(1,`primapearl_r_new`.`cscart_pages`.`usergroup_ids`))) and ((`primapearl_r_new`.`cscart_pages`.`use_avail_period` = 'N') or ((`primapearl_r_new`.`cscart_pages`.`use_avail_period` = 'Y') and (`primapearl_r_new`.`cscart_pages`.`avail_from_timestamp` <= 1764990319) and ((`primapearl_r_new`.`cscart_pages`.`avail_till_timestamp` >= 1764990319) or (`primapearl_r_new`.`cscart_pages`.`avail_till_timestamp` = 0)))))"
          }
        },
        {
          "table": {
            "table_name": "cscart_page_descriptions",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "page_id",
              "lang_code"
            ],
            "key_length": "9",
            "ref": [
              "primapearl_r_new.cscart_pages.page_id",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 0,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "0.02",
              "eval_cost": "0.01",
              "prefix_cost": "1.42",
              "data_read_per_join": "253"
            },
            "used_columns": [
              "page_id",
              "lang_code",
              "page",
              "description",
              "meta_keywords",
              "meta_description",
              "page_title",
              "link"
            ]
          }
        },
        {
          "table": {
            "table_name": "cscart_ult_objects_sharing",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "share_object_id",
              "share_company_id",
              "share_object_type"
            ],
            "key_length": "159",
            "ref": [
              "primapearl_r_new.cscart_pages.page_id",
              "const",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 0,
            "filtered": "100.00",
            "using_index": true,
            "cost_info": {
              "read_cost": "0.02",
              "eval_cost": "0.01",
              "prefix_cost": "1.45",
              "data_read_per_join": "10"
            },
            "used_columns": [
              "share_company_id",
              "share_object_id",
              "share_object_type"
            ],
            "attached_condition": "(`primapearl_r_new`.`cscart_ult_objects_sharing`.`share_object_id` = `primapearl_r_new`.`cscart_pages`.`page_id`)"
          }
        },
        {
          "table": {
            "table_name": "cscart_seo_names",
            "access_type": "ref",
            "possible_keys": [
              "PRIMARY",
              "dispatch"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "object_id",
              "type",
              "dispatch",
              "lang_code"
            ],
            "key_length": "206",
            "ref": [
              "primapearl_r_new.cscart_pages.page_id",
              "const",
              "const",
              "const"
            ],
            "rows_examined_per_scan": 10,
            "rows_produced_per_join": 0,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "0.16",
              "eval_cost": "0.07",
              "prefix_cost": "1.68",
              "data_read_per_join": "1K"
            },
            "used_columns": [
              "name",
              "object_id",
              "type",
              "dispatch",
              "path",
              "lang_code"
            ]
          }
        }
      ]
    }
  }
}