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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '5be71a84316d50b75a8a6b8ba7d080c47c663353cf0079679cc1e6d1c76236c6' 
  AND token = 'XBkh/GQHmb/GpQV0qbh4+HnkjfmPxR6ax+zB5yGqcsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00860

JSON explain

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