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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 (
    1515, 1514, 1512, 2708, 4555, 421, 1967, 
    423, 422, 4558, 2723, 7735, 7734, 6193, 
    7737, 6195, 6194, 7736, 7750, 6196, 
    4415, 4417, 4414, 4412, 4416, 7588, 
    7589, 7590, 7591, 7592, 7240, 7237, 
    7236, 7238, 7239, 5875, 5877, 5874, 
    5879, 5880, 5873, 5876, 5878, 5881, 
    5872, 3999, 4004, 4005
  )

Query time 0.00027

JSON explain

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