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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '591be6d82ed03237cbf495d8b25ade07d114e8f86d639c5d3b18d052f8b9a9f5' 
  AND token = '/cilJoKru5o55/lK5SM7KWWBrSUAddVPByyMUOl0sdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00761

JSON explain

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