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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 (
    9842, 9843, 9844, 9845, 9846, 9847, 9848, 
    9849, 9850, 9851, 9852, 9853, 9854, 
    9855, 9856, 9857, 9858, 9859, 9860, 
    9861, 9862, 9863, 9814, 9815, 9816, 
    9817, 9818, 9820, 9821, 9822, 9823, 
    9824
  )

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}