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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '34b8ef1211e2c566ca0633cae29eabb93879be5acb58a3e5b63e2cc1fc2e5be2' 
  AND token = 'qmzmBY9Rgz2mPSnbDEWI+bhARle3xvavpTBLiWC2EcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01038

JSON explain

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