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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 (
    4973, 4974, 4975, 4976, 4977, 4978, 4979, 
    4980, 4981, 4982, 4983, 4984, 4985, 
    4986, 4988, 4989, 4990, 4991, 4992, 
    4994, 4995, 4996, 4997, 4998, 4999, 
    5000, 5001
  )

Query time 0.00025

JSON explain

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