Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35beb536747a32aebebdfce53bb963740d7edb0789cc9f30c0032cc78796243f' 
  AND token = '4nqV+EXeiljf7L6Rxd4LxWuRD0JIsX2eq1ve8u4ipHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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