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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '1822d6482effbb036ab183a7c83cb425f9ff481cc93618818a159c280855b348' 
  AND token = 'JmVAjvKeywCQDSOKNMtm4CDpG8duESIKKCkhDVzDv8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00995

JSON explain

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