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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '45a58c88fb016ef52b7656a93c96d8e0e15c582c84c4ad6f92f0cdb2467151f6' 
  AND token = 'a3IQD3e6uBYXu0LT2YtHAvNbSYjiZxIExHfyy4vc5tQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00738

JSON explain

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