SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '969a1cc940c0469ff73e80fcf66bf87d3560830b6d201b8f67634ba104828c5c' 
  AND token = 'JNERyQYT9sdT6/FvfZe1pIGydBctBBkK2wdDhdVZByI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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