SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    6777, 6778, 6779, 6780, 6781, 6782, 6783, 
    6784, 6785, 11375, 10778, 8680, 6786, 
    6787, 6788, 6789, 8008, 9495, 7914, 
    6790, 6791, 6793, 6794, 6795
  )

Query time 0.00066

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 (6777,6778,6779,6780,6781,6782,6783,6784,6785,11375,10778,8680,6786,6787,6788,6789,8008,9495,7914,6790,6791,6793,6794,6795)"
        }
      }
    ]
  }
}