SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb62622e61871d6aff8e8521395260a381eb5c5d5e0f7944c466ace999f4659' 
  AND token = 'EfOYV+8y2yT/AsVa8a/kFnLSquKQhMjA9WR+UGGLCxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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