Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f4b445f6ce1cdfc579f4af42f4a717fb80c691c1a04b065c59a9246c670c5cb' 
  AND token = 'f6TKQnWp+saWXhbFflFUe1IS1UHfh0AMaFWnJNiScak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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