SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e82a281aef52a191a55fbeca67588ce27dae527982bf04beec98644ab8527f4' 
  AND token = '+FGUJ8fC8mpf0V/l1kJr3pf5sTYG+QARdEEtYImNmFA=' 
  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