Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f9c3b172d09f32606dee988699945812b5fd4179ecb15b40044a9359f5478c6' 
  AND token = 'xYibe8GeqgHadWlX/APf8ZeLqe027JTebEo3zmDyM48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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