Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9acc98e99063d53fd5f22beeea54881b6c4dac34867e230a230b8e3f5aa65fc6' 
  AND token = 'H5gGnzNsrbzGsTO8SzenV8JVbxvCQrEQhTiprTXCj1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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