SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77b756c0c9bfd2a6642481426da788584f57836d2281c0a38072cdb0b90bd023' 
  AND token = '+t1sZ749Raw4oFWUoTHCoH4JLEM2GEAGRlP8OWa+BDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

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