Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '606b991e7dca1dbea9537a3f141f3c5fcbfe517f2838c3babc268ed192bbadd5' 
  AND token = 's9zer+LDQrMuTT7gzFb30FIA/KGCKV5fqgYOPzDf3ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

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