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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 (
    325721, 21545, 18228, 163607, 164330, 
    169528, 175066, 184043, 191208, 216438, 
    263004, 279659, 295751, 307166, 308366, 
    315969, 315971, 317489, 317495, 317523, 
    317945, 321995, 321998, 324572
  )

Query time 0.00026

JSON explain

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