Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45ebc96bfccc1c37ebf3726aef3e9b997ec1d1a5010f9082f3699e517f052150' 
  AND token = 'PT/tQxCp/rkR48nDdIHcKtj59ql/jzY54vyRn9M8Ci4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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