SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f22048cd785ddaa326492579128157b10ae146812e39ab6451f10a9d9630c43' 
  AND token = 'rwqYoVQoWqPz0E1aiKTjG1+kIdBkS+kPIcv7GYVUQXA=' 
  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"
    }
  }
}