SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = 'f79fdf721bffea3f2099f4a3faf42df5d07f206f0f1245651ad8179880418e2c' 
  AND token = 'tBFvGH3MkYu9AZ8/+kKwIk7MORqt8WqUzurLXeQbgmc=' 
  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"
    }
  }
}