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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb3b9d463b2f4223f52d8e79af63532da2498ba97968fb33f1167a42666c454f' 
  AND token = '5ujnLzJLR4/iRb8Vp59EB74PC5rpVyYgA58m9WsOLIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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