Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bf74c060321eb51a8f7d56e0a92fafd77d8cfddb20d3fcbee18f96efd8ea18b' 
  AND token = '2VmA8ovvWc7jtuUI3fRslZ997Km7snZp/O+NPGusjBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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