SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84323c5a642adb2e244be4c2221a6ecf74f4c290dbb0a75643ab459e6d4a516b' 
  AND token = 'lqpdK9umTPxyqS7/WhB1XjM4E7VpQsytIpePmdMaNVg=' 
  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