Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d31126a5bccb5d5138c786f828d3aeaf074e94e8d70c346dc0212c02b8ca602' 
  AND token = 'd8rY/QH9FG8QqT+8xmuvaY4CUhSMDoO7gtCjCNk2Luk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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