Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4111c21cad8df9d828cb869fe8747f21cf9a263aa9d5cf21219ddd16eaa0deb7' 
  AND token = '3V2rEySki0J5NXrV5du5nhnLznw++kzOOAFUE394S1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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