SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84643f822ffa95e75ec725fd97f0e23508418f1ab3e2145359d3dc50dbd3795d' 
  AND token = 'CrLLqwXBYErMXqMD8XabXh/EzvwPgkfnzoUzc7/3HNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

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