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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae5360a61808d785432bf6b5483522038d53e5c4eafa65273f1a27f9faa8bbc' 
  AND token = 'fX11uITxOhNAGRyLTbA8a8iFlYOoknbaq2hOQzs990Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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