Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '268054d07e8ecdb9fcd2de3f96b7c0a3666a7f94d5c0f4ab6a874e3345a2b857' 
  AND token = 'K+cl6PdTXWvKP1wIopIJ5DDLbTG3Igins7r7f38ivAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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