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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '82f75535d4523dec02a416efb1836e72e05c1435e765ffe12fc0f62d45b4c4cb' 
  AND token = '/CRpA2Rl2HGDv4+6etk7ve+B/1yODJv3zsyViK0SZTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00755

JSON explain

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