Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dff6184dd68604040098ab9da06b6cbaf4c938ad56756913c93ea12008f7e25' 
  AND token = 'kC82cwHqm4VPw6wVBxiwL6V7ddCmHGEPIMwtP85eV1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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