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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 (
    7596, 7597, 7598, 7599, 7600, 6413, 6412, 
    6414, 6415, 6419, 6420, 6418, 6417, 
    6416, 5607, 5605, 5606, 5699, 5703, 
    5701, 5700, 5697, 5702, 5698
  )

Query time 0.00045

JSON explain

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