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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33ff5fb2266f59b5287c742b161e02b15c8cf68f769d38ed8b2eaca8cf21dc24' 
  AND token = '2mfuS1kxkFyJ5R7WOMqEXwX9KEEwMvDHpl1aX5iKYn0=' 
  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"
    }
  }
}