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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 (
    6581, 6580, 4690, 4679, 7358, 7360, 7361, 
    7363, 5725, 7362, 7357, 7364, 7359, 
    7280, 7959, 7966, 7961, 7964, 7960, 
    7965, 7962, 7544, 4241, 3635
  )

Query time 0.00066

JSON explain

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