SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb9b363c113196d1856b9782c38e8752cdb35189f41a03fbef692a5a06767c33' 
  AND token = 'kKHeqS9L7zRJKLxqKcClGhEPHgsCUSG/uea9pr/QLS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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