Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01e765e92f84021dde6ec75fccdf442d9a97dca1e91fd1cb9dcca1a3a2f33794' 
  AND token = 'egzUckYe6Jsr91uGJLJViqUico51ic7TvhJihVOFmQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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