Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1cd408c367af005382ac6f47b1c06ae1080636ee57ca2378d0743ebd43d76d4' 
  AND token = 'QhLFVQniAiElFgKqJ+SRz73kk5lUGf8bPsvjAZAAcbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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