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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2d8bd57dc9c3e40e03bcad930ea8c183762c72045a40505337a8c62b96a70e4' 
  AND token = 'nDXHAN0+7YnVqUCEGuo7H6SnI9hlZFtbq8kuCSyARBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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