SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a0fdf212e8e8631ae0cb8e902911623e56ef3dc155748e78020608219b98be' 
  AND token = 'tpVaVDixHW4ESS+0WQuA+PERShBncP0b8EBXDFBaimA=' 
  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