Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f47e59bf596b80521920049374ac84e9a0d4057c460cefe16f1c2a68c154db74' 
  AND token = 'jDw1UsKgFuiRXyylE5bQk7sONVqQ8wzjYdyoYedcqwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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