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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc5fd6bc9c0c801f4faa15d3f296488d86a73ab3a64d846b314c49f19d30c6c' 
  AND token = 'KwaEhQvk3UPko8Q2E9akUo8xdvQIFkzsp91DU9gYjUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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