SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd670d3ab12b7584feaaed1d846f71f805a022fbed23e8f87673986253a887e15' 
  AND token = '48QiMIKmwSjgrc9gTy+lp0RFXYjVZrvx9Wtht9nXh9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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