SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'c9a210ea05524390aaad35fc7058943b235e7a9192c13b2e0f7e62db8d7e4662' 
  AND token = 'FCn/8rq8wOM5tdy+dNCgLjisYrkhsWKwDSk8/f4KJcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01054

JSON explain

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