SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a63b95cc920f6f5020afa27417b0dc7d483ea42f1bccb7c6f12ca18d7f01f489' 
  AND token = 'MSeND2pDswH+eKx1kezdiYRV6rCUaOG2lW9b87yRx/c=' 
  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