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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'a0a0fd2dc2b2d58ce85bf2cd85789f1ba9e734b7fe6b7fb5b4c0fc5b9ef6cbd9' 
  AND token = 'tEdkxfVOW9bKp7sOzc9S6Y76f3Sjzwv/xkLfeibry8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00765

JSON explain

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