Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '492bfbb81197ef80ca5585313eda70e56b81a22ca9dbb36dd879ab98d0f41fd6' 
  AND token = 'Syly0ekKpD3CnQpltSUQfGpCzdpCJnWiTNS55oWKrsI=' 
  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"
    }
  }
}