Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c168fba0ecc0874aa565275f0f33f427253105db3b8e85fb2815ef77d54f7a9b' 
  AND token = 'd4q4TASoEIeQdN5h6kRlr78IkBsXtSNzhkIW9DciE+I=' 
  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"
    }
  }
}