Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f06476ede45ef01cd69752f6133bca1fcd510a1d37ec0822479379a8d6c07374' 
  AND token = 'kT5fCUwTJW7HsUPR9MqEy5qxh9S3pGhxUSE8Axz/h6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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