SELECT 
  cscart_products.* 
FROM 
  cscart_products 
WHERE 
  cscart_products.product_id IN (
    63430, 60978, 60980, 60979, 61620, 61621, 
    60976, 60975, 60981, 63231, 63234, 
    63816
  )

Query time 0.00052

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,
      "attached_condition": "cscart_products.product_id in (63430,60978,60980,60979,61620,61621,60976,60975,60981,63231,63234,63816)"
    }
  }
}

Result