Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd2d65bd73a801a9a0fb7fd25440c1fbd39f8f7d1fd5d4d7bed6a006bc66a81' 
  AND token = 'Wn4x2srZOWPe/JaWueSxvgjTSFbANxvOcyK9AKgPrlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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