SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8c4d25d4ae68a365a289d53d711550184592334e3d8b33af9682f4cdd2fafcb' 
  AND token = 'sMv0GCYufTNwn1QWXstIzoXDuFlAyGWqE/hkBa8r6wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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