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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8a7730fe75b375af94903b77a9e5e775c67d7b281d3a3b581317a10e55e003b' 
  AND token = 'jJeR5HaYJjBxWe8oCCgr3XWi7JUJQqRCzi7FxnrGCO0=' 
  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"
    }
  }
}