SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '4d31ba00d7014964cf21d8aff8a594fe85b32b5e71f2d9cbd9afdfa063cb4204' 
  AND token = 'qAsy6B/Ua0VJHZ2J+D41aI/D9u7ZUzhVr6VCQvqPeCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00770

JSON explain

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