SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    1491, 1496, 1497, 1498, 1480, 1570, 1571, 
    1572, 1626, 1784, 1286, 1287
  )

Query time 0.00095

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": 12,
      "filtered": 100,
      "index_condition": "cscart_products.product_id in (1491,1496,1497,1498,1480,1570,1571,1572,1626,1784,1286,1287)"
    }
  }
}