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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2682fd36fc7f6cee5b7691bd1d2f003e7e8fbde13459a58f762f5f94f338ac60' 
  AND token = 'BKzkvrp1JFenpeLjTVaXNRI/2WW1C/SyPIF03h2sK8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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