Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebafc4f99d986f56f8b7ef44773fffa4e9cb61b9844be519c174118811bedfac' 
  AND token = 'hLuSum3vZBUTq9Adx/yza77WtZu9GU8jaude6hldQns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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