Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '544ecd4479d674b4e07bc8a4e7adcc8107245febd933b9bb0c8217a5b2611752' 
  AND token = 'zfmnVqH4/OvSuUm1ppSFy14ehJFZ5wXPo+g7aMrAzt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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