SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cda6b4db51f0d0ca9bb84a50e1d3fa83947ce9b15432f419b2eee256b9f7ba32' 
  AND token = '/03MMu0jkIJqPBTV2i/iOG+8DzhSiT/gaOnhRAKXxyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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