SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7c0f51ef49c734b4d2f43ecf969842673adabadba0fbf211f1f7f1f7eb186aa' 
  AND token = 'rpCAaA2ggJZXqBqY/oAGdICP9y2hD0+MS9TsC9V+Fw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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