SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb03f3fd179db5415ef338256345f655dd197d7a1fddc0831b7c7774b906ad3' 
  AND token = 'ZNcRBzUjw9JaVZJNZH4fqfe+7p6JyXTmfYMSgWCQyTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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