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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '4ea59c0633e728c8f51c17e7cd2e6a9953d2ffddab2ab257bb240e7c2c45b7d8' 
  AND token = 'TpBPQl7naXD1PPwAH0wIVzmkpEnFb8CSz/ogZeon5OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00756

JSON explain

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