SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '3cb3ae79f67e680ec42dc1e28b3fb25a1c538e7410312c69e33fc5c13c2fb8c8' 
  AND token = 'AYDZ25HVXR2UfVxEwqygLSq6vdh2MlehuuUBENzCzgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01193

JSON explain

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