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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 (
    20673, 20947, 22253, 20168, 19430, 19431, 
    19432, 19438, 19439, 19440, 19443, 
    19444, 19445, 19760, 19761, 19814, 
    19815, 19816, 19817, 19819, 19861, 
    20674, 22462, 21341, 19934, 19138, 
    19433, 19434, 19435, 19436, 19437, 
    19441, 19442, 19759, 19818, 19932
  )

Query time 0.00044

JSON explain

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