Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '0f097503a30a2941434e95123092c68ddbd5df02e80aa92d0a20e1ff8398bad1' 
  AND token = 'nJ7IVnFGUFJEEUEqdR5P+GHcpo5dVGjccqgvPUdId3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00751

JSON explain

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