SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a8bdaa49f26589b22b43e6df5df52154175d148cebe67fb9155b8f1d98c006c' 
  AND token = 'xDzvBUqSLlBhX+G64nppct+7hZrJMJTBiK9iw6xPwKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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