Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c92253e4b806bf91dcc2cf7630246de908d0fab16da03e3b1ed0d81e1e8a8b3' 
  AND token = 't1veIya+IK2+xaL5va7kiM3oE2M1mKBsmys6VG+YnI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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