SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eef23f065f0ab1cfa8988a25ab7169bd69a6cc598f19506dee8f0b53fc976d57' 
  AND token = 'XcxXCJwzNu/oMBo78xVC+VvbGuLoqtvLGcEqw5WjgvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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