SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '343e09640e4bf3a014d5959dcb10814ea30d879263cafb49a920e49757eccdaa' 
  AND token = 'SoGJywnVF8DOsIz7AhqwKGs7KUzqGqjJWRvpIVNoSjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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