Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e866a94032ace44988e11efd03863c0b92f2bde54c8cf8267cfce3a4ad8a8cc' 
  AND token = '2+m9MbsiSqZtsYnOeOpZfyOtv5qJtaUb23M8bZ9FWyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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