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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 (
    295774, 303250, 308376, 316325, 317505, 
    319376, 325547, 325710, 325715, 322000, 
    6276, 19341, 119170, 142807, 162962, 
    164053, 180420, 220516, 238478, 242500, 
    263871, 295549, 295825, 317507
  )

Query time 0.00029

JSON explain

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