Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b204bf3d940dd565ab7cde551db331bba4caeaa05536c439376742fe2c938ef0' 
  AND token = '2s9OktIkAmkOg1n0ZH+Xgp4v0iKQHnNYfg+vmOPD5Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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