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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd17a7ee8a032842b12a135136229a9ce18dc48095f8117845ef1942ca4f69615' 
  AND token = 'WR9ZR/7F7J0SfsMYIflkHuE6BGJSqMmyMc0dVZCqCQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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