Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae7ce7e8a09cd1e1daa7a9de50ff2c66a74052f7448f6b826e4927c62bf7897d' 
  AND token = '3qy8TYJ77qI9f7dHQ0H9k10RzHaqp3Mnam7QGOK/BLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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