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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 (
    5695, 5696, 5694, 5691, 7258, 7257, 7259, 
    7260, 7261, 7256, 6714, 6713, 6715, 
    6693, 6712, 6711, 1458, 1462, 1460, 
    1461, 1459, 1463, 7733, 4242
  )

Query time 0.00021

JSON explain

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