SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    19024, 19129, 18885, 19039, 20770, 20433, 
    20512, 19707, 19710, 20729, 19548, 
    19471, 10846, 8669, 8670, 7515, 9721, 
    9286, 7608, 19046, 19537, 19047, 19417, 
    20514, 20538, 20515, 20539, 20732, 
    20733, 19072, 20525, 20526, 9539
  )

Query time 0.00115

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": 33,
          "filtered": 100,
          "index_condition": "cscart_products.product_id in (19024,19129,18885,19039,20770,20433,20512,19707,19710,20729,19548,19471,10846,8669,8670,7515,9721,9286,7608,19046,19537,19047,19417,20514,20538,20515,20539,20732,20733,19072,20525,20526,9539)"
        }
      }
    ]
  }
}