SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f3b49d48a0b1f327c6a8d257d099f83023d326b7adc6958014436c930178f44' 
  AND token = 'WGwMwpAh+M2C5swJ0l9Dxi/D61QK7DXj/SbfWSJ2Rq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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