SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6001920b3c6c5e60e23215adc6d488b927c1595af30d2f95c7a07246a280c8a' 
  AND token = '66aaGpp0qEP4kunYmf7Wz0bjUZKNKeJvpHLwT+IxDSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

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