SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '189b5b73425f6af56b543e1211c1e78c9d62c0140f3d75dd2d0728d2ded32b0d' 
  AND token = '3yZqiRUq2hSsVQeG2ikGyQbziYpr/HsqMY/Qalb8fzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

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