SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b16a908a439d66bef5353c7a099fd920dcb31d39529560fc1cc8bdbe1221d093' 
  AND token = 'BmLbd2KopLOzh1Hx+0pNkTZgX0/2OpGSZwK9YLDH6/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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