SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c11ff088cc47e841a6dd8e7459e8306270996ba2687423c8c88039c80483bbb2' 
  AND token = 'GHRc3Mg2NNw7a/B5l6RFOfc6hvkjs7vhIkKcrlhbGxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

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