SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f6cbdad511bcf31dc9ae58d2683cf6c034be303ed58bec496188940b21a0191' 
  AND token = 'bfhJ4ZQ2l9cUEUogFnbhohs8do2pYjD1D2jI91WPx+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

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