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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '69d72a3786da0726f866cf52ed2c2d10d564578688551175a5729ffd5dd2f083' 
  AND token = 'Sa5XkfPJMqfcIApwFe7uQVXi/N2KtjlDxAIizuN4fM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00758

JSON explain

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