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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '7a54fd1f43313600d5d5abede8841fa7b76f67693e98fe1c5437f1c6d88c7eb7' 
  AND token = 'Pi6WaUl4blfufouMs3rF3SFN5zkv1EMSEWFouLMSvD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00771

JSON explain

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