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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '92c65385baf0bac0e7e0d27d30f2e28dbaa0d8ea2e355fedfcb35680f8f1a7d4' 
  AND token = 'c8LnX02iSjaGVconV5RWEYlbApWtCEHBRmO4qRrHA0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00746

JSON explain

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