SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '297699e2642b7134aa7ad9765ad41f29b3f84ea24fde1d459b2166abbcf15849' 
  AND token = 'h7HYeHJwLjmDKlwJfiTsHZEzapTZ/f+E4Uziez+kt8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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