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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5dec569747e0a4bd0d92c9bf5a1700831cc973c8fc21746a456e657f7d5eace' 
  AND token = '+/QUcfxyZq/OMGi2DPrDiUOax2aXbaAEkn45QK5SLgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

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