Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a3beea093dc920e36c13897132b5d0ad09439737d3480ebe28d930fab74d06b' 
  AND token = '4CqfEELmBh0ICW4quttzzE+ChmTjqOZbKFBVxIuWeqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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