Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb2a36765f18f2a8986a3b7ff1c97acdd85e8fcf68c8be51f282b7b833cb4572' 
  AND token = 'ZfpQOExJZu1FNsd5Q93zrIYPFklyU6hqBROwuiWbMDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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