Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2a514fdefc432a7124b4f47444dece7d4ab867923019e0f525d0125b76ffb85' 
  AND token = '093SaFBKT6Sraqsl39d5jW7wMabmUxYPl+oMClm5/ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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