SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a265a817e193cb383352d0e5e480525d079f5267d148b6e3b92b01def2656583' 
  AND token = 'SuDfBDKWwHYjRhI4b4Gh9/E3WDFcTLnIFtmJqPqLr5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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