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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fe2f66069dad414dae4881d6a5fa9cca0c887e5c828a200c248b38b8ce3bbf9' 
  AND token = 'rXzGc3sJLmU3xe28AbQ8j4+ttmSiUMkLH1hwu1llPUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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