Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fed28a79c67f3d136a392f81c515cc310827943b2659d105eb0d05d8b1f031b1' 
  AND token = 'IywooImqv7eyaV2hg2DgKy5Gz0nL5M3w0eAyqExpzIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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