SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0c36b6305411ccd8bb82f7148885b07921418627d1b831c49a4c61a0155a0ab' 
  AND token = '3qCol5xFJ7QPx3IhQs0GFC1/px7KB+E+P3htsPZ13yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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