SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '888d265aa11d3b226b1e450a77fd62769586fc19712d1e6a9917ead5bd1e490c' 
  AND token = 'SthBxpyRMWd8DYm+qyXHrDt9k0z/rWWpf0heYRpBX2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

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