Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdabfb5bb4deff2ed613936d328e25ab87acf56c0b0db2fb90dcbc667e3f5d76' 
  AND token = 'j4zqEGoAtlmZhE0XSXG4r1X4uTHgfc9IMigU1PB4Tpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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