Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'b56d8ea3118f4fa2f8002b0f293209ca24244d2b744c329d08a2cc99259422f7' 
  AND token = 'Gn8Ghyr755bQ+KxmxQUAObHdctc84O3UX8yeE0XZqIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00746

JSON explain

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