Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c9b48efe6da657a9dd3b8f6990eab310c49e4661301263f03de2825511704d0' 
  AND token = 's3bQL9iFt6mLl2lEjxuGyPf7S4RQa9ZiYRiEdIbxg2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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