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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '313515be0f12ace9d328c893465d5161d06ce7ff68812697d93a97a0c41e8dbd' 
  AND token = 'zfIWpiiCaAr0+jLE0TQVh1FKJN2IRdu/RpzyHTlS14A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00776

JSON explain

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