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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c5a8ef2f0788c1cc2306489cf6339ab726a056e813ff6cdc45fa81a175a4df0' 
  AND token = 'qU0nMEHKgjZbVI9f72Zmbmb0lRkc5mCMaw3I0JVnoSo=' 
  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"
    }
  }
}