SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    736, 739, 744, 754, 812, 816, 826, 873, 
    1543, 1790, 2001, 2008, 2061, 2150, 
    416, 513
  )

Query time 0.00103

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_products",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["product_id"],
      "rows": 16,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (736,739,744,754,812,816,826,873,1543,1790,2001,2008,2061,2150,416,513)"
    }
  }
}