Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf690346a31f61920a134b80c10f01e54c3a281776b513f0aa08c13b38b0f74e' 
  AND token = 'WJmWbDzD1nr5UjYtw5t1zMC8DKl4yOqIJQfKMbh6prs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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