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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd494b5c90f1d2366e5619ae9edacaf2f4f69ad7386de8b42e479b7c43b29ffc2' 
  AND token = '9VJ6BiTOBzFpjzN45J0a48WUAYnV4aev6mviJ07H6YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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