Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2f51d6b576a02886c222f33be6cf0f82004065a48eb27c0849b6c8220249d09' 
  AND token = 'LeQRFRc1AvvS8/GiSu8EHGddvkGIyIjUMuQSNEzxL64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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