SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd712fa60b9d67063bb05396c6910e9097a02d38df62a037e8235df7dbe154045' 
  AND token = 'xuCxWhOVEbk2+WGOPu+L+znbUywFE+xr95+9SPVTGN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

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