SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2ca3171ba599760fc54995216ee20e634fcfd9fdc5b1e52d92a7ee27206c79' 
  AND token = 'U4gYrgdMsvsPGchhBmvKlGXh7/EbsUDuTJtxqz8LHNE=' 
  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"
    }
  }
}