SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bbef11ab8ce17d5063840aada5f685d4065e9f8ee3e365b69a15e485a151748' 
  AND token = 'Mz34s8f/t0D5YDZyk1fxqCpOiom1FN1UExEnc74m23c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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