SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    73, 303, 339, 507, 508, 537, 1565, 1566, 
    1567, 1568, 1569, 1570, 5556, 5473, 
    5474, 504, 1843, 1841, 1855, 1840, 1853, 
    486, 1854, 1842
  )

Query time 0.00077

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": 24,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (73,303,339,507,508,537,1565,1566,1567,1568,1569,1570,5556,5473,5474,504,1843,1841,1855,1840,1853,486,1854,1842)"
    }
  }
}