SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    23103, 21847, 21848, 18498, 18499, 18500, 
    18540, 18541, 18542, 19188, 6840, 13558, 
    13613, 11472, 19184, 19183, 19189, 
    19186, 19187, 19185, 12830, 20293, 
    12828, 12831
  )

Query time 0.00109

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 (23103,21847,21848,18498,18499,18500,18540,18541,18542,19188,6840,13558,13613,11472,19184,19183,19189,19186,19187,19185,12830,20293,12828,12831)"
        }
      }
    ]
  }
}