SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '252502bf0f4c8c7cef1282ed244d34683258ba596fa501b90377da475285bea3' 
  AND token = '8LeN64wvHj/mtBg+GH282Xv9wSSpth+s9UjUIKI/NSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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