SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14afcbdcf9a843122a220bc99c5a7c6bb8387f7776e2836a01f965877294c553' 
  AND token = 'Xju4Yvl3xnw27N103/lIQBVCZQ2u5IIGhF0hYw8RKoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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