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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '6847e8d467555abae5d217c60c26f662c2614a4910d7a660b75185b0a1041fcd' 
  AND token = 'W0NHhuUKjYEhQsRO2vTu2sAP3TjckiJfsiuCTrLbnYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01483

JSON explain

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