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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08edcd184c6dfcf09adccd0ea898f476c9e21974477c62f7a8aa0974cec0c8ba' 
  AND token = '9YoB8MXB5eM9bxyvqF9+7pSReDJhKlsBwN1RdLO8oJg=' 
  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"
    }
  }
}