Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8889cfac1e22e9df23bfaf93bad38b8a3359699e94d2a1d98ca7ee304159afb' 
  AND token = 'QsCC05PuFHfabAeqfiGHQ0kAJltauLriqfK+O3rcLzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}