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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '024345ba897687806ce9d4184acfcf893112f20255f18764a6ed32ef7be4f448' 
  AND token = 'Nhtl/Iv4XBh/G17tLQA2ZLnqAKI7ugf+A4utIJ29oQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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