Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bec23e5ff7262da1ed38390a45a1e00474b65fed0d10df5a70bc0c2b6fbdcd4' 
  AND token = '3v6LPb3wWYHxRTj+H92DhAZiaS0Z1GkB+wiQ42ctNNM=' 
  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"
    }
  }
}