SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '501df25fdc362864a581b65d53a3e9387397ca58725a3597e3f043766127150d' 
  AND token = '1qcki9bjUels8SLaOVgAqul3qAlOkgLjlxswvGgKJ4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00008

JSON explain

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