SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edffd89c44fb82045c65e2c5272f3ecaf7faad6172ac82ca887419a27f232584' 
  AND token = '3NRelQ+f86OOB/wOrdZNxkMdht2w0NHXJwxoYlSvmeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

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