SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    18727, 18750, 18728, 18729, 18731, 18733, 
    18734, 18735, 18737, 18736, 18738, 
    18739, 20047, 17986, 17976, 19106, 
    19107, 11456, 11172, 7613, 7522, 11230, 
    10378, 13102
  )

Query time 0.00089

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "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 (18727,18750,18728,18729,18731,18733,18734,18735,18737,18736,18738,18739,20047,17986,17976,19106,19107,11456,11172,7613,7522,11230,10378,13102)"
        }
      }
    ]
  }
}