SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c05189c63fa21c92b1a2584cea7f56e425e9dc70973e39af613ceb03b55b48cd' 
  AND token = 'FOHhBJ5rqKmpIIrrNyvYelyHRL6GK/+wpxhg9fWO6IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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