Sandbox

SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '37b3c081ec2e6b9f000b066021d4e76082d964aaaa32b57d51e8e26a6eafce1e' 
  AND token = 'gaEuKh3gH7T14CjwsaartcryBMa6PTsfLSzkORBtLJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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