Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49697389c5b600a370c6a284fb8d8a55e1f20590273c69b173e835e13d4e4697' 
  AND token = 'MRfccAlF4QAzsZV882r7bkt2P0yAtE9inslWrESsG6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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