SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4efe76a27ff0dd31dc74f3f1f414440e858de1dce20ba642119b332cdcae2ae7' 
  AND token = 'Gh7Oq2i/sVwiBuAZ/kbSz9b7ZylED+w/Pjpg6wNfKVc=' 
  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"
    }
  }
}