Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a12e37a6be0fdd9ace88c13a6f89af6719276ac5f8222ff7faf0db1cf935c73' 
  AND token = 'SBP4EspJmcRSUEXachdqkaRJHscprYqzWOETqqk8iwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE								Impossible WHERE noticed after reading const tables