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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '416a334b53fd62f29589180132d9cc3f68e0a8d6a2b0f3f6f756c8035654c245' 
  AND token = 'orFmsQumZ4p3wEcT9aR7nLXm9gI7NCYXTJeGC5SFSlc=' 
  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"
    }
  }
}