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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '264745f4d822f4fa13e53b725cd7bf00f52e3625b832ee30a9b944692061e3a5' 
  AND token = '0E44YPjsncOvv+DEHTvjyLKl1lNazRCyg82x3cnU69o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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