SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d8bc41feec28c397fc1c9f3761b698d5a59e55fe198054be536a3fc6c5357b' 
  AND token = 'YjF/wQLQMtlHZx47liigFTmB/Lh32vrSfYrYD+xocgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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