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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 (
    255937, 261905, 285197, 295199, 308276, 
    175507, 183486, 210887, 219447, 230988, 
    238401, 258620, 291797, 295645, 308206, 
    308208, 308216, 308235, 308270, 308296, 
    311250, 321986, 31811, 68070
  )

Query time 0.00033

JSON explain

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