Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e0658099b1d3984c3979482c42f2fe47ea737c7692a462d676a698eaaa86f8c' 
  AND token = 'SMMaTeirJXKmSg8sc5yKikeWkFM6eBg1vDf9y3Kmpkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

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