SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b26baee2b464a69bdb6f314af48cb17bfb4af968662680cd0aee356fc435df18' 
  AND token = 'YJZtn+bGT1+rTzerawmqiXVdWkwpaqYa+sKPFDxkb7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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