Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49c29908cec40d8458c1ba0240a83566338c2b2d7f74c8fe68210ad85324aab9' 
  AND token = '8ZOCnDf2QkhL8Wi9X1vzJ52t2V0QYL09xJKFi9zTIJU=' 
  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