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SELECT 
  f.feature_id, 
  f.purpose, 
  p.product_id, 
  p.parent_product_id, 
  g.id, 
  g.code 
FROM 
  cscart_product_variation_group_features AS f 
  INNER JOIN cscart_product_variation_groups AS g ON f.group_id = g.id 
  INNER JOIN cscart_product_variation_group_products AS p ON f.group_id = p.group_id 
WHERE 
  p.product_id IN (
    8530, 7902, 8509, 8531, 7904, 8555, 7553, 
    7935, 7555, 7984, 7557, 7934, 7937, 
    8026, 7987, 7995, 7810, 7986, 7976, 
    7801, 7849, 8048, 7936, 7809, 7897, 
    7564, 7515
  )

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}