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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 (
    6324, 4579, 4580, 5419, 5180, 5420, 5711, 
    5714, 5866, 6033, 5157, 4749, 5636, 
    6408, 7427, 6387, 4969, 4968, 5721, 
    7641, 2626, 2627, 5784, 5782
  )

Query time 0.00037

JSON explain

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