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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'f1486eacb2934c3cb6be667148344d68a03e6d8419a2e68ac6ee3873882fee49' 
  AND token = 'o7wEbQ+eVhWAnPtRbIdddtmR+xGRKdLLgmwM+zCOXoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00756

JSON explain

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