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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a982d5d0e2a6294e99a088ac07643c93b52e7d13fd601d7c71ad391098c32efb' 
  AND token = '/AH8oAzt35ehw+TkGOicsuNdSzRt6FFiCs1AJEYYJqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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