SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'fec8bbfc809fdaa197f3e6481b2b6c0472809d3212ec4c9d265f6698c6ecdba2' 
  AND token = 'XlhDMNWnoGBqZg2ug0Gh6wRx40RECVtumOu95wAwp+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00007

JSON explain

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