Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6329d70e91b74502ebec156e7d18a466ef781da659cc8c5ec1a54ea149dfd9ad' 
  AND token = 'x6K01/3uN03ncs3XrATx6qUZpr9/kLkWP/G5Gq+HY8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}