SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa01d2b3f8f96ed38c7a751e0693e480a87c43ba5aaf18101c78296e97d392cd' 
  AND token = 'PHLVv+yQRM0lS8T+/64CuYJDO4dGjKdyoZ0hcbrYtuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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